forms.py 文件源码

def role_id_is_valid(form, field):
    """
    Checks for validity of User's Role

    :param form: The form which is being passed in
    :type form: Form
    :param field : The data value for the 'role' inserted by User
    :type field : SelectField
    """
    role = Role.query.filter(Role.id == field.data).first()
    if role is None:
        raise ValidationError('Role id is invalid')